Tool-holder.



PATENTED MAR. 21, 1905.

. bm m1. N

ivo. 785,351.

UNITED STATES Patented Maren 21, 1905,

[PATENT OFFICE.

WILLIAM WV.` DOOLITTLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO CRANE COMPANY,OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TOOL-HOLDER.

SPECIFICATION forming part of Letters Patent N0. 785,351, dated March21, 1905.

Application filed October 15, 1903. Serial No. 177,099.

T0 a/ZZ whom t may concern.'

Be it known that I, VILLIAM W. DooLITTLn, a citizen of the UnitedStates, residing at Chicago, in the State of Illinois, have in ventedcertain new and useful Improvements in Tool- Holders, of which thefollowing is a specification.

My invention relates to means for holding tools, such as drill chucksand the like, and particularly to means for readily adjusting the lengthof the tool in revolving chucks in drilling machines. The objects of myinvention are to provide a ready and accurate means for regulating orshifting the position of the drill or other similar tool; to provide anadjustable 'tool holder in which the tool is readily removable withoutthe use of screws or nuts for the purpose of clamping in place; toprovide a differential adjustment for the position of the tool so thatit may be varied in position as desired, while avoiding mere frictionalmeans of holding in place; to provide independent adjustable means forholding the tool against rotation and for inducing the pressure on thesame, and to generally improve the structure and operation of toolholders, and provide for economy in the use of the whole tool. Theseobjects, together with other advantages which will hereinafter appear Iattain by means of the construction illustrated in preferred form Y inthe accompanying drawing, wherein- Figure 1 represents an end viewrofthe tool holder;

Figure2 is a partial central longitudinal section of the tool holder;

Figure 3 is a view of a drill and a partial section of the shank of thesame, showing my screw attaching device thereon;

Figures 11 and 5 are cross sections respectively of the shank of thetool and of the screw attaching device placed thereon, the same beingtaken on the line (4)-(5) in Figure 3;

Figure 6 is a cross section of the end of the tool holder taken on line(6) in Figure 2;

Figure 7 is a cross section of the retaining sleeve on the drill, takenon the line (7) in Figure 9;

Figure 8 is an underplan view of the retaining sleeve shown in Figure 9;

and may co-operate with any particular means for preventing rotation ofthe tool in the tool holder. In order to provide for a quick andaccurate adjustment of the length of the drill, or its projection fromthe chuck, I provide a tubular holder 11 which has ahead 12 and insideits hollow shank is provided with'screW threads 13 which extendapproximately through a quarter of the circumference and arediscontinued and the metal cut out between the two opposite rows ofthreads as indicated by the space (16) in Figure 1. The head 12 oftheholder is provided internally with two inwardly projecting guide lugs 14which at the bottom have an upturned end forming a notch 15 therein fora purpose hereinafter described.

On the top of the shank of the drill 17 I provide a reduced shank 18which is bored with holes to receive the pin 19, and upon this shank Iplace the partially threaded head 20, which is provided with a series ofholes in order to be angularly adjusted to different positions withrespect to the cutting point or flutes of the drill, and it has,opposite to each other on two sides and extending through about aquarter of a turn, a series of,,partial threads 22 to co-operate withthe threads 13 in the tool holder. It will be understood from this thatwhen the drill is pushed into the holder in such position that thethreads 22 register with the open space (16) in the tool holder, thedrill may be raised or lowered any desired amount, and then by givingthe drill a slight turn the respective threads 22 and 13 will engageeach other to hold the drill rmly in place against a thrust at anydesired point along the interior of the holder 11.

To co-operate with this means for quickly and accurately adjusting thelength of the drill or its projection from the holder, I may use anydesired or approved means for retaining the drill against rotation asthe holder 11 rotates, or in case the work rotates, to hold the drillstationary in the holder. narily I prefer to use the retaining sleeve asillustrated in Figures 7 to 10. The sleeve 23 may be provided with aprojecting flange 24, and its interior either through the whole lengthor only at one end as illustrated in Figure 9, is provided with anopening 25 which accurately fits over the flutes of the drill 17, asshown in Figure 10. The sleeve then being placed over the drill can beeasily slid along it to any desired position depending upon the lengthto which the-drill is desired to extend from the tool holder. On itsoutside, the sleeve 23 is provided with a rib 26 which ends in anupturned hooked end 27 to co-operate with the notch 15 on the inwardlyprojecting' rib of the holder, shown in Figure 2. I preferv to use twoof these ribs 26 and two of the notches 15, in order to give a moresecure joint.

The parts being constructed as shown, it will be evident that the sleeve23 being slid along the drill flutes to the proper position, the drillshank carrying the attached threaded head 2() will be slid into theshank of the holder 11 to the desired position, while the rib 26 on thesleeve 23 will slide in the open space between the ribs 14. (See Figure6.) When properly adjusted to position, by giving the drill a partialturn the threads will lock the drill in place against longitudinalmotion while the two hooks 27 and 15 will engage and lock together toiirmly retain the drill against rotation. When it is desired to loosenthe drill from the socket it is only necessary to raise sleeve 23 todisengage the hooks and give the drill a slight backward turn todisengage the threads 22 and 13, when the drill is readily drawn out ofthe holder; or being partly withdrawn, the sleeve 23 may be adjusted toa new position and the drill readily re-inserted to the desired length.It will be seen that by this arrangement the whole of the length of thedrill may be used up, thus making a great saving in the steel, which isordinarily largely wasted on account of the necessity oi' a long shankto the drill. The many other advantages ot' this device will be readilyapparent to those familiar with the art.

Having thus described my invention 'and illustrated its use, what Iclaim is new and desire to secure by Letters Patent, is the following:

1. rIhe combination with atool having a partially threaded head thereon,of a tool holder comprising a tube provided on opposite sides of itsinterior circumference with partial threads to engage the threads of thetool head, and separate devices in the holder and on the But ordi-V toolto prevent the rotation oi' the tool in the holder, substantially asdescribed.

2. In an adjustable tool holder the combination of a tube having tworows of partial threads extending along the inner surface thereof, and apartially threaded head on the tool, the threads on said head and in thetube being so placed that the head in one position may slide in the tubeand in another position engages therein at any desired point, anddevices upon the tool and within the tube to prevent the rotation of thetool in the holder.

3. In a tool holder the combination of a tube provided with oppositelydisposed rows of partial threads therein, a tool having a partiallythreaded head to engage the threads of the holder at differentpositions, and means in the holder for retaining the tool and headagainst rotation therein.

et. In a holder for a liuted drill, the combination with means forholding the drill against longitudinal movement in said holder, a sleeveiitted upon the drill iiutes so as to rotate therewith and beingadjustable longitudinally in position thereon, and provided with aprojecting rib, and an inwardly projecting rib in the drillholder,'whereby the drill is prevented from rotating in the saidholder.

5. In a tool holder a sleeve adapted to fit the irregular outline of thetool and slide thereon for adjusting its position thereon but not toturn thereon, combined with a holder tube having devices for holdingsaid sleeve therein against rotation and means to prevent longitudinalmovement of the tool with respect to the holder.

6. The combination of a tool holder tube having an inwardly projectinglug therein, a retaining sleeve mounted upon the tool and adapted toslide thereon but engaging so as not to rotate with respect to the tool,and said sleeve having upon its outer surface a lug adapted toco-operate with the lug in the holder tube to prevent the sleeve fromrotating, and engaging threads between the tool and the holder tube toprevent longitudinal movement of the tool in the holder, substantiallyas described.

7. The combination with a cylindrical tool holder provided on itsinterior surface with rows of partial threads, a tool provided with ahead having partial threads thereon to cooperate with the threads in thetool holder to prevent longitudinal movement of the tool therein, asleeve upon the tool mounted to slide along the same and to rotatetherewith, and means within the tool holder to prevent the rotation ofthe retaining sleeve within the said holder when adjusted to position,substantially as described.

8. In a tool holder, the combination of a tube having devices thereinfor holding the tool against longitudinal movement and for engaging thetool at different positions longi- IOO | axial position and disengage inanother axial position, and means engaging the tube and tool to preventthe tool from turning in the tube, substantially as described.

In testimony whereof I have hereunder signed my name in the presence ofthe two subscribed Witnesses.

WILLIAM W. DOOLITTLE. Witnesses:

PAUL CARPENTER, EDWARD C. BURNS.

